Nova Patents
US6951671B2

Ink jet printable heat transfer paper

Summary by NHIP

Multi-layer ink jet heat transfer paper

The invention provides an ink jet printable heat transfer material featuring cold release properties through a multi-layer coating structure. The composition includes a cold release layer with silicones, crosslinkers, and controlled release additives, followed by a wash layer of thermoplastic polymers and an ink receptive layer containing cationic materials.

Claim Score by NHIP

Read claim 1, the broadest

Abstract

This patent describes an ink jet printable heat transfer material with cold release properties. The invention consists of multiple layers of coatings applied to a suitable substrate, typically paper. The first optional layer coating consists typically of a pigmented coating bound together with a synthetic or natural binder and is applied in sufficient quantity to level and densify the surface of a given substrate. The second coating is applied over the first and consists of a silicone coating with a controlled surface energy. The surface energy must be such that the subsequent aqueous coatings can be applied over top with good wetting and adhesion, but low enough for an easy removal from the heat transfer after cooling. A third or wash layer is applied over the silicone release layer. This layer must easily wet and adhere to the silicone release layer so the coating does not come off during subsequent coating passes and during handling by the user. The wash layer consists of one or more thermoplastic polymers including ethylene acrylic acid, waxes, and other polymers along with dispersions of non-water soluble plasticizers and antioxidants. An ink receptive layer consists of a low binder thermoplastic organic pigmented coating containing non-water soluble plasticizers and antioxidants along with water soluble and insoluble cationic polymers and/or cationic inorganic pigments. The non-water soluble cationic materials, either organic or inorganic, aid in the retention of the dyes and reduce the wet bleed and wash out of the dyes when the transfers get wet.

US6951671B2, drawing sheet 1
Sheet 1 of 4

Term

Term ended

Expired 6 February 2022, 4.6 years ago.

  1. Priority and filed
  2. Granted
  3. Expired
  4. Today

43 claims: 3 independent, 40 dependent

  1. 1
    Broadest claimClaim Score 77, broad(NHIP)An ink jet printable heat transfer material comprising:a cold release layer comprising: one or more silicones;one or more crosslinkers;and one or more controlled release additives for silicone chemistries;a wash layer;and an ink receptive layer.
  2. 38
    The ink jet printable heat transfer material of claim wherein the high porosity inorganic material is between about 0 and about 80 dry percent of the ink receptive layer.
  3. 43
    An ink jet printable heat transfer material comprising:a substrate, said substrate comprising hardwood fibers, softwood fibers and precipitated calcium carbonate;a precoat layer, said precoat layer comprising clay, polyvinyl alcohol, carboxymethylcellulose and a binder;a cold release layer, said cold release layer comprising emulsion silicone, a matting agent and catalyst;a wash layer, said wash layer comprising ethylene acrylic acid, urethane adhesion promoter, non-water soluble plasticizer, and fluorosurfactant;and an ink receptive layer, said ink receptive layer comprising polyethylene wax, high porosity polyamide powder, ethylene-vinyl chloride emulsion, cationic acrylic synthetic pigment, cationic polymer, non-water soluble plasticizer, dispersion stabilizer, non-water soluble antioxidant, isopropanol, acetone and a mixture of wetting and flow agents.